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android之应用程序LED(zz) [复制链接]

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发表于 2011-11-22 00:25:56 |只看该作者 |倒序浏览

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参考友善的LED程序，自己也写了个，不是用友善的libfriendlyarm-hardware.so，自己用NDK中的例子hello-jni写了个程序，已经编译成libhello-jni.so.自己摸索了好久总算有点收获，感谢各位网友的帮忙。部门源码贴出来给大家参考！刚搞完就拿出来分享了，欢迎大家指正。有谁想看libfriendlyarm-hardware.so的源码的可以参考这个。
JNI部分用C语言实现

复制代码

/*
* Copyright (C) 2009 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#include <string.h>
#include <jni.h>
#include <fcntl.h> /*包括文件操作，如open() read() close()write()等*/
int fd;
/* This is a trivial JNI example where we use a native method
* to return a new VM String. See the corresponding Java source
* file located at:
*
* apps/samples/hello-jni/project/src/com/example/HelloJni/HelloJni.java
*/
jstring
Java_com_helloworld_helloworld_stringFromJNI( JNIEnv* env,
jobject thiz )
{
return (*env)->NewStringUTF(env, "Hello from JNI create by carlin !");
}
jint Java_com_helloworld_helloworld_openled( JNIEnv* env,
jobject thiz )
{
fd = open("/dev/leds0", O_RDONLY);
if (fd < 0)
{
fd = open("/dev/leds", O_RDONLY);
return 1;
}
return 0;
}
jint Java_com_helloworld_helloworld_setLedState( JNIEnv* env,
jobject thiz ,jint ledID,jint ledState)
{
ioctl(fd,ledState, ledID);
return 1;
}
jint Java_com_helloworld_helloworld_closeled( JNIEnv* env,
jobject thiz )
{
close(fd);
return 1;
}

APP部分即JAVA

复制代码

package com.helloworld;
import android.app.Activity;
import android.widget.TextView;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.view.View.OnClickListener;
public class helloworld extends Activity {
private Button btnLED1On;
private Button btnLED1Off;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
openled();
btnLED1On = (Button)findViewById(R.id.btnLED1On);
btnLED1Off = (Button)findViewById(R.id.btnLED1Off);
btnLED1On.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v) /**当按钮按下*/
{
setLedState(0,1);
}
}
);
btnLED1Off.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v) /**当按钮按下*/
{
setLedState(0,0);
}
}
);
}
/* A native method that is implemented by the
* 'hello-jni' native library, which is packaged
* with this application.
*/
public native String stringFromJNI();
public native int openled();
public native int setLedState(int ledID,int ledState);
public native int closeled();
/* This is another native method declaration that is *not*
* implemented by 'hello-jni'. This is simply to show that
* you can declare as many native methods in your Java code
* as you want, their implementation is searched in the
* currently loaded native libraries only the first time
* you call them.
*
* Trying to call this function will result in a
* java.lang.UnsatisfiedLinkError exception !
*/
public native String unimplementedStringFromJNI();
/* this is used to load the 'hello-jni' library on application
* startup. The library has already been unpacked into
* /data/data/com.example.HelloJni/lib/libhello-jni.so at
* installation time by the package manager.
*/
static {
System.loadLibrary("hello-jni");
}
}

复制代码

/*
* Copyright (C) 2009 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#include <string.h>
#include <jni.h>
#include <fcntl.h> /*包括文件操作，如open() read() close()write()等*/
int fd;
/* This is a trivial JNI example where we use a native method
* to return a new VM String. See the corresponding Java source
* file located at:
*
* apps/samples/hello-jni/project/src/com/example/HelloJni/HelloJni.java
*/
jstring
Java_com_helloworld_helloworld_stringFromJNI( JNIEnv* env,
jobject thiz )
{
return (*env)->NewStringUTF(env, "Hello from JNI create by carlin !");
}
jint Java_com_helloworld_helloworld_openled( JNIEnv* env,
jobject thiz )
{
fd = open("/dev/leds0", O_RDONLY);
if (fd < 0)
{
fd = open("/dev/leds", O_RDONLY);
return 1;
}
return 0;
}
jint Java_com_helloworld_helloworld_setLedState( JNIEnv* env,
jobject thiz ,jint ledID,jint ledState)
{
ioctl(fd,ledState, ledID);
return 1;
}
jint Java_com_helloworld_helloworld_closeled( JNIEnv* env,
jobject thiz )
{
close(fd);
return 1;
}

APP部分即JAVA

复制代码

package com.helloworld;
import android.app.Activity;
import android.widget.TextView;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.view.View.OnClickListener;
public class helloworld extends Activity {
private Button btnLED1On;
private Button btnLED1Off;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
openled();
btnLED1On = (Button)findViewById(R.id.btnLED1On);
btnLED1Off = (Button)findViewById(R.id.btnLED1Off);
btnLED1On.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v) /**当按钮按下*/
{
setLedState(0,1);
}
}
);
btnLED1Off.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v) /**当按钮按下*/
{
setLedState(0,0);
}
}
);
}
/* A native method that is implemented by the
* 'hello-jni' native library, which is packaged
* with this application.
*/
public native String stringFromJNI();
public native int openled();
public native int setLedState(int ledID,int ledState);
public native int closeled();
/* This is another native method declaration that is *not*
* implemented by 'hello-jni'. This is simply to show that
* you can declare as many native methods in your Java code
* as you want, their implementation is searched in the
* currently loaded native libraries only the first time
* you call them.
*
* Trying to call this function will result in a
* java.lang.UnsatisfiedLinkError exception !
*/
public native String unimplementedStringFromJNI();
/* this is used to load the 'hello-jni' library on application
* startup. The library has already been unpacked into
* /data/data/com.example.HelloJni/lib/libhello-jni.so at
* installation time by the package manager.
*/
static {
System.loadLibrary("hello-jni");
}
}

图片：

应用程序在这

右边的那个LED程序是我的

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